All are associated with pituitary apoplexy except :
**Core Concept**
Pituitary apoplexy is a medical emergency characterized by sudden hemorrhage or infarction of the pituitary gland, often presenting with severe headache, visual disturbances, and hormonal deficiencies. The pituitary gland is susceptible to apoplexy due to its rich vascular supply and the presence of lactotrophs, somatotrophs, and corticotrophs that are prone to hemorrhage.
**Why the Correct Answer is Right**
Pituitary apoplexy is commonly associated with pre-existing pituitary adenomas, particularly lactotroph adenomas (prolactinomas) and somatotroph adenomas (somatotrophinomas). These adenomas can undergo hemorrhage or infarction due to their rapid growth and vascularization. Additionally, corticotroph adenomas can also be associated with pituitary apoplexy. The sudden loss of pituitary function can lead to hormonal deficiencies, including adrenal insufficiency, hypothyroidism, and hypogonadism.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is not a known association with pituitary apoplexy. While pituitary adenomas are a common cause of pituitary apoplexy, this option does not provide any relevant information.
**Option B:** This option is incorrect because it is actually a known association with pituitary apoplexy. Pre-existing pituitary adenomas, particularly lactotroph adenomas, are a common cause of pituitary apoplexy.
**Option C:** This option is incorrect because it is actually a known association with pituitary apoplexy. Corticotroph adenomas can also undergo hemorrhage or infarction, leading to pituitary apoplexy.
**Clinical Pearl / High-Yield Fact**
Pituitary apoplexy is a medical emergency that requires prompt recognition and treatment. The sudden loss of pituitary function can lead to severe hormonal deficiencies, and prompt hormone replacement therapy is essential to prevent further complications.
**Correct Answer: A.**